TY - JOUR AU - Motreanu, Dumitru AU - Motreanu, Viorica V. AU - Papageorgiou, Nikolaos S. PY - 2004/12/01 Y2 - 2024/03/29 TI - Periodic solutions for nonautonomous systems with nonsmooth quadratic or superquadratic potential JF - Topological Methods in Nonlinear Analysis JA - TMNA VL - 24 IS - 2 SE - DO - UR - https://apcz.umk.pl/TMNA/article/view/TMNA.2004.028 SP - 269 - 296 AB - We study a semilinear nonautonomous second orderperiodic system with a nonsmooth potential function which exhibits a quadraticor superquadratic growth. We establish the existence of a solution, usingminimax methods of the nonsmooth critical point theory. ER -